// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package utils

import (
	"fmt"
	"os"
	"sync"
)

var (
	// pid the current running process id
	pid string

	// pidOnce make sure get pid once
	pidOnce sync.Once
)

// CurrentPID return the current running process id
func CurrentPID() string {
	pidOnce.Do(func() {
		pid = fmt.Sprintf("%v", os.Getpid())
	})
	return pid
}
